Rigidness and Unadaptability

Rigidness noun - The quality of being rigid and rigorously severe.

Unadaptability and rigidness are semantically related. In some cases you can use "Unadaptability" instead a noun "Rigidness".

Unadaptability noun - The inability to change or be changed to fit changed circumstances.

Rigidness and unadaptability are semantically related. Sometimes you can replace term "Rigidness" with "Unadaptability", this nouns are similar.